Add plugin support
switch from sorted sets to hashes
fix spec tests
rename server attr from name to address
batch can now update configs and score values
more plugin documentation
GET requests for backend info now includes configs
enable keepalive pool by default
check function exists before running it
code refactor and optimzation
minor plugin tweaks
compile lua
minor tweak
update readme
Add support for max_path_length of zero
update example nginx conf

tweak travis
Allow plugins to halt request with an error
update CHANGELOG
remove debug print statements from spec
update readme [skip ci]